Exodus 28:29-30

“Aaron will regularly carry the names of the sons of Israel on the Breastpiece of Judgment over his heart as he enters the Sanctuary into the presence of GOD for remembrance. Place the Urim and Thummim in the Breastpiece of Judgment. They will be over Aaron’s heart when he enters the presence of GOD. In this way Aaron will regularly carry the Breastpiece of Judgment into the presence of GOD.